Mount Vernon Why Two Quotes for the Same House Can Look So Different
Ask three contractors to price the same Mount Vernon home and you can end up with three numbers that don't seem to belong to the same job. That's not necessarily someone padding a bid or someone else lowballing to win the work. Siding pricing is built from a stack of separate decisions — square footage, what's coming off the wall, what's going on it, how much trim and detail work is involved, and how the crew handles the parts of the house that give installers the most trouble. Change any one of those and the total moves, sometimes by a lot.
This page walks through the real cost drivers in the order they usually matter, so you can look at a quote and understand what you're actually paying for — not just the bottom line.
The Starting Point: Size and Wall Complexity
Square footage sets the floor, but it's not the whole story. A 2,200 square foot home with four flat wall planes and simple gable ends prices very differently than a 2,200 square foot home with dormers, bump-outs, multiple roof pitches meeting the walls, and a wraparound porch. Every inside corner, outside corner, window, and roofline intersection adds cutting, fitting, and flashing work that a simple rectangular wall doesn't need.
What adds complexity
- Multiple stories, which change scaffolding and staging needs
- Dormers, bay windows, and bump-outs
- Steep or complicated rooflines that meet the siding at odd angles
- Porches, columns, and decorative trim details
- Tight lot lines that limit access on one or more sides
None of this means a complex home isn't worth doing right — it just means the labor hours behind the number are real, not inflated.
Tear-Off vs. Overlay: What's Underneath the Old Siding
Before new siding goes up, a decision has to be made about what's already there. Full tear-off — removing the existing siding down to the sheathing — costs more up front than overlaying new siding on top of old, but it's the only way to actually see what's happening underneath. In a lot of older Mount Vernon and Skagit County homes, that matters more than it sounds like it should.
Skagit County's mix of driving rain and long stretches of damp, moss-friendly weather means moisture has had decades to find its way behind poorly flashed windows, old caulk joints, and butt seams in whatever siding was installed originally. Tear-off is the point where a crew finds rot, soft sheathing, or failed house wrap before it becomes a bigger problem — and where they can correct it instead of sealing it behind a new wall. Overlaying skips that inspection. It's sometimes appropriate on a sound, dry wall, but it's a decision that should be made with eyes open, not just to save money.
Product Choice: Material Is Not Just a Line-Item Swap
The siding material itself is one of the biggest line items, but the sticker price only tells part of the story. Vinyl is the cheapest material up front and the fastest to install, which is why it's common on spec-built homes. LP SmartSide and similar engineered wood products sit in the middle. Fiber cement — the category James Hardie belongs to — typically costs more than vinyl per square foot, both in material and installation labor, because it's heavier, requires specific fasteners and clearances, and takes longer to cut and fit correctly.
We install James Hardie fiber cement exclusively, and we're upfront that it isn't the cheapest option on the shelf. What it buys you is a non-combustible product engineered for wet, coastal-adjacent climates like ours, a factory-applied ColorPlus finish that doesn't rely on a field paint crew getting every coat right, and a warranty structure built around decades of real-world performance rather than a lab test. We'd rather explain that trade-off honestly than install something we don't believe will hold up on a Skagit County wall through twenty winters of salt air and driving rain off the Sound and the Skagit River delta.
Rough material comparison
| Material | Upfront Cost | Maintenance Over Time | Typical Lifespan |
|---|---|---|---|
| Vinyl | Lowest | Low, but can fade and crack; not repairable in sections | 15-25 years |
| Engineered wood (LP-type) | Mid | Moderate; moisture-sensitive at cut edges and seams | 15-30 years, install-dependent |
| Fiber cement (James Hardie) | Higher | Low; factory finish resists fading and moisture intrusion | 30-50 years, install-dependent |
These are general ranges, not promises — actual performance always depends on installation quality, maintenance, and site exposure.
Trim, Accessories, and the Details That Don't Show Up in the Square-Footage Number
Field siding — the flat panels or lap boards covering most of the wall — is usually the cheapest part of the material list per square foot. Trim, corner boards, window and door casing, fascia, soffit work, and any decorative elements cost more per linear foot and take more time to install correctly. A home with a lot of architectural detail will show a bigger gap between a bare-bones estimate and a full-scope quote than a plain rectangular home will.
This is also where corners get cut on lower-end bids. Undersized trim, missing flashing at butt joints, or skipped kick-out flashing above roof-to-wall intersections save a contractor money today and create the exact moisture entry points that cause problems five or ten years down the road — especially under Mount Vernon's rainfall totals.
Labor, Weather Windows, and Installation Quality
Fiber cement is installed correctly or it isn't — there's not much middle ground. Proper fastener placement, correct gaps at butt joints, weather-resistive barrier detailing, and flashing at every penetration all take time and experience. Rushing those steps to save labor hours is exactly how a well-chosen product ends up with a moisture problem.
Skagit County's climate also affects scheduling. Crews here work around a genuinely long wet season, and moss growth on north-facing walls and shaded elevations is a normal part of life in this part of Washington. A crew that understands local conditions will detail flashing and clearances with that in mind — keeping siding off grade and hard surfaces, managing water at deck ledgers and roof transitions — rather than installing to a generic spec sheet written for a drier climate.
Factory Finish vs. Field Painting
One underrated cost factor: whether the color coat comes from the factory or from a painter on site after installation. James Hardie's ColorPlus finish is baked on in a controlled factory environment with a warranty attached to the finish itself. Field-painted siding — common with primed wood products and sometimes with fiber cement bought unfinished — depends entirely on weather conditions during application and the quality of the paint crew. In a climate with as much moisture in the air as ours, a factory finish removes a variable that's otherwise hard to control.
Permits, Disposal, and Site Access in Skagit County
A few practical items round out the number:
- Permits — most re-siding jobs in Mount Vernon and unincorporated Skagit County require a permit, and fees vary by project scope and jurisdiction
- Disposal — tear-off generates old siding, house wrap, and sometimes damaged sheathing that has to be hauled and disposed of properly
- Site access — narrow side yards, fences, landscaping, or a second story without easy staging can add setup time
- Sheathing repair — if tear-off reveals rot or soft spots, replacing sheathing is additional work that's impossible to price accurately until the old siding is off
A contractor who won't discuss these until the wall is opened up isn't hiding something — sheathing condition genuinely can't be known for certain until then. What matters is whether the quote explains how that scenario would be handled and priced if it comes up.
Getting a Number You Can Actually Compare
The reason quotes vary so much often comes down to scope, not honesty. A number that only covers field siding and skips trim, flashing detail, and disposal will always look better on paper than a complete scope of work — until change orders start showing up mid-project.
What to ask for in any quote
- Whether the price includes full tear-off or overlay, and why one is being recommended
- Which specific James Hardie product line and profile is being quoted, not just "fiber cement"
- Whether trim, corner boards, and soffit/fascia work are included or priced separately
- How flashing at windows, doors, and roof-to-wall intersections will be handled
- What happens, cost-wise, if sheathing repair is needed once the old siding comes off
- Whether the quoted price includes permit fees and disposal
A contractor willing to walk through each of these line by line is giving you a real number, not just a headline figure designed to win the bid.
If you're weighing a siding replacement on a Mount Vernon home, we're happy to walk your house, point out what we see, and put together a clear, itemized estimate — no pressure, no obligation. The form below is the fastest way to get that started.